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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator:                      
Net income attributable to common shareholders $ 4,084 $ 4,563 $ 4,849 $ 4,478 $ 8,229 $ 4,099 $ 4,900 $ 3,746 $ 17,933 $ 20,974 $ 15,645
Denominator:                      
Denominator for basic earnings per share-weighted-average shares                 11,804 11,814 11,638
Effect of dilutive securities-Stock options                 100 163 232
Denominator for diluted earnings per share-adjusted weighted-average shares                 11,904 11,977 11,870
Earnings per share attributable to common shareholders:                      
Basic - net income attributable to common shareholders $ 0.34 $ 0.39 $ 0.41 $ 0.38 $ 0.70 $ 0.35 $ 0.42 $ 0.32 $ 1.52 $ 1.78 $ 1.34
Diluted - net income attributable to common shareholders $ 0.34 $ 0.38 $ 0.41 $ 0.38 $ 0.69 $ 0.34 $ 0.41 $ 0.31 $ 1.51 $ 1.75 $ 1.32